Fixed gps background task

Breda-Tour/Data/Gps.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using Windows.ApplicationModel.ExtendedExecution;
 using Windows.Devices.AllJoyn;
 using Windows.Devices.Geolocation;
 using Windows.Devices.Geolocation.Geofencing;
@@ -13,6 +14,7 @@ namespace Breda_Tour.Data
 {
     public class Gps
     {
+        private ExtendedExecutionSession session;
         private MapPage mapPage;
         private Geolocator geolocator;
 
@@ -44,12 +46,13 @@ namespace Breda_Tour.Data
             switch (accessStatus)
             {
                 case GeolocationAccessStatus.Allowed:
-                    geolocator = new Geolocator{DesiredAccuracy = PositionAccuracy.High,MovementThreshold = 3};
+                    geolocator = new Geolocator { DesiredAccuracy = PositionAccuracy.High, MovementThreshold = 3 };
                     // Subscribe events
                     geolocator.StatusChanged += OnStatusChanged;
                     geolocator.PositionChanged += OnPositionChanged;
                     // Get position
                     _position = await geolocator.GetGeopositionAsync();
+                    StartLocationExtensionSession();
                     break;
                 case GeolocationAccessStatus.Denied:
                     _status = PositionStatus.NotAvailable;
@@ -92,5 +95,27 @@ namespace Breda_Tour.Data
                 mapPage.ShowLocaton(_position.Coordinate.Point);
             }
         }
+
+        private async void StartLocationExtensionSession()
+        {
+            session = new ExtendedExecutionSession();
+            session.Description = "Location Tracker";
+            session.Reason = ExtendedExecutionReason.LocationTracking;
+            session.Revoked += ExtendedExecutionSession_Revoked;
+            var result = await session.RequestExtensionAsync();
+            if (result == ExtendedExecutionResult.Denied)
+            {
+                Debug.Write("Denied!!!!");
+            }
+        }
+
+        private void ExtendedExecutionSession_Revoked(object sender, ExtendedExecutionRevokedEventArgs args)
+        {
+            if (session != null)
+            {
+                session.Dispose();
+                session = null;
+            }
+        }
     }
-}
+}